Abstract deprecated and selectany for GCC and remove LLVM'ism where possible (#22662)

* Abstract selectany

* Fix initializer element is not constant

src/corefx/System.Globalization.Native/pal_icushim.c:58:34: error: initializer element is not constant
 static const int MaxICUVersion = MinICUVersion + 20;

* Enable ms extensions

* Apply LLVM patterns to GCC

* Remove deprecated function

* Fix const conversion error

src/corefx/System.Globalization.Native/pal_calendarData.c:390:16: warning: passing argument 1 of ‘ures_close_ptr’ discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
ures_close(erasResBundle);

src/corefx/System.Globalization.Native/pal_calendarData.c:419:22: warning: initialization discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
char* name = GetCalendarName(calendarId);

* Remove old compiler option

1 files changed, 0 insertions, 26 deletions

diff --git a/src/vm/appdomain.cpp b/src/vm/appdomain.cpp
index 42e26c99d1..6d68dff1a3 100644
--- a/src/vm/appdomain.cpp
+++ b/src/vm/appdomain.cpp
@@ -3120,32 +3120,6 @@ Assembly* SystemDomain::GetCallersAssembly(StackCrawlMark *stackMark,
     return NULL;
 }
 
-/*static*/
-Module* SystemDomain::GetCallersModule(int skip)
-{
-    CONTRACTL
-    {
-        THROWS;
-        GC_TRIGGERS;
-        MODE_ANY;
-        INJECT_FAULT(COMPlusThrowOM(););
-    }
-    CONTRACTL_END;
-
-    GCX_COOP();
-
-    CallersData cdata;
-    ZeroMemory(&cdata, sizeof(CallersData));
-    cdata.skip = skip;
-
-    StackWalkFunctions(GetThread(), CallersMethodCallback, &cdata);
-
-    if(cdata.pMethod)
-        return cdata.pMethod->GetModule();
-    else
-        return NULL;
-}
-
 /*private static*/
 StackWalkAction SystemDomain::CallersMethodCallbackWithStackMark(CrawlFrame* pCf, VOID* data)
 {