Bump to mono/mono@8c085a99b32 (dotnet#4725)

Fixes: dotnet#4713

Context: mono/mono@10795da1c065c
Context: mono/mono@8c085a99b32e9

Changes: mono/mono@075c3f0...8c085a9

  * mono/mono@8c085a99b32: [reflection] Check whether a pointer is valid before dereferencing (#19842)
  * mono/mono@89d772a3abb: Always include Unicode charinfo, so tar made in csc mode works in mcs mode (#19813)
  * mono/mono@e9d3af508e4: Bump bockbuild to get mono/bockbuild#159
  * mono/mono@d6f0c25d34d: [2020-02] Bump msbuild to track mono-2019-12 (#19661)

Whenever Xamarin.Android runtime needs to instantiate a managed type,
it first looks it up by calling:

	MonoType *type = mono_reflection_type_from_name ("MyType, Assembly", nullptr);

The `nullptr` pointer refers to an instance of the Mono `MonoImage`
structure and if `nullptr`, it should cause Mono to find the correct
image containing the type and load it, if not already loaded.

The pointer is propagated down the call chain inside Mono and due to
one of the functions called not properly validating its arguments, the
`nullptr` pointer was dereferenced, leading to a crash similar to:

	libc    : Fatal signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x4c0 in tid 11029 (ompanyname.app3), pid 11029 (ompanyname.app3)
	crash_dump64: obtaining output fd from tombstoned, type: kDebuggerdTombstone
	/system/bin/tombstoned: received crash request for pid 11029
	crash_dump64: performing dump of process 11029 (target tid = 11029)
	DEBUG   : *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
	DEBUG   : Build fingerprint: 'google/sdk_gphone_x86_64/generic_x86_64:10/QSR1.190920.001/5891938:user/release-keys'
	DEBUG   : Revision: '0'
	DEBUG   : ABI: 'x86_64'
	DEBUG   : Timestamp: 2020-05-25 14:45:29+0200
	DEBUG   : pid: 11029, tid: 11029, name: ompanyname.app3  >>> com.companyname.app3 <<<
	DEBUG   : uid: 10134
	DEBUG   : signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x4c0
	DEBUG   : Cause: null pointer dereference
	DEBUG   :     rax 000000000000002f  rbx 0000000000000001  rcx 0000000000000000  rdx 0000000000000030
	DEBUG   :     r8  0000000000000003  r9  000000000013e2e2  r10 0173eed800000000  r11 0000000000000206
	DEBUG   :     r12 0000000000000000  r13 00007478530343c0  r14 00007478075eda33  r15 000074780763efb0
	DEBUG   :     rdi 0000000000000000  rsi 00007478e2cb14d0
	DEBUG   :     rbp 00007ffef3a35680  rsp 00007ffef3a355d0  rip 0000747807a4066a
	DEBUG   :
	DEBUG   : backtrace:
	DEBUG   :       #00 pc 00000000003ba66a  /data/app/com.companyname.app3-aQUF6Ge6_v-WaLb5i8Q7vw==/lib/x86_64/libmonosgen-2.0.so (_mono_reflection_get_type_from_info+474)
	DEBUG   :       #1 pc 00000000003ba3d1  /data/app/com.companyname.app3-aQUF6Ge6_v-WaLb5i8Q7vw==/lib/x86_64/libmonosgen-2.0.so (mono_reflection_type_from_name_checked+321)
	DEBUG   :       #2 pc 00000000003ba26d  /data/app/com.companyname.app3-aQUF6Ge6_v-WaLb5i8Q7vw==/lib/x86_64/libmonosgen-2.0.so (mono_reflection_type_from_name+125)
	DEBUG   :       #3 pc 000000000000ddb5  /data/app/com.companyname.app3-aQUF6Ge6_v-WaLb5i8Q7vw==/lib/x86_64/libmonodroid.so (xamarin::android::internal::EmbeddedAssemblies::typemap_java_to_managed(char const*)+389) (BuildId: 9952f1cfe0d910ae631abc73479f88eef34fd71d)
	DEBUG   :       dotnet#4 pc 000000000000def3  /data/app/com.companyname.app3-aQUF6Ge6_v-WaLb5i8Q7vw==/lib/x86_64/libmonodroid.so (xamarin::android::internal::EmbeddedAssemblies::typemap_java_to_managed(_MonoString*)+99) (BuildId: 9952f1cfe0d910ae631abc73479f88eef34fd71d)
	DEBUG   :       dotnet#5 pc 0000000000069532  <anonymous:5ad25000>

Mono commit mono/mono@10795da1c06 fixes this issue.

.external

@@ -1,2 +1,2 @@
 xamarin/monodroid:d16-7@8d51d0af0572db1583a8ab5ec095bec3046ae476
-mono/mono:2020-02@075c3f06197e3b969f4234d0f56a2e10ee6ee305
+mono/mono:2020-02@8c085a99b32e99ae2f0a6b3de61541fefb4d3389

Documentation/release-notes/4725.md

@@ -0,0 +1,9 @@
+#### Application Mono Framework behavior on device and emulator
+
+- [GitHub 4713](https://github.com/xamarin/xamarin-android/issues/4713):
+  Starting in Xamarin.Android 10.3, SIGSEGV during
+  `monodroid_typemap_java_to_managed` could cause apps to abort if the
+  application was built with the `$(AndroidEnablePreloadAssemblies)`
+  set to `False`, that is assembly preload at application startup
+  would be turned off and the application happened to use a managed
+  type which resides in an assembly not yet loaded by the runtime.