Make type comparisons more general purpose (#20940)

This has two parts:

## Part 1
CoreRT represents native type handles differently from CoreCLR - on CoreCLR, `RuntimeTypeHandle` is a wrapper over `RuntimeType` and RyuJIT is aware of that. On CoreRT, `RuntimeTypeHandle` wraps the native type handle, not a `RuntimeType`.

The knowledge is hardcoded in importer when importing the sequence "ldtoken foo / call Type.GetTypeFromHandle" - importer just removes the call and bashes the result of ldtoken to be a reference type. CoreRT had to avoid reporting `Type.GetTypeFromHandle` as an intrinsic because of that.

I'm adding another helper that lets RyuJIT avoid hardcoding that knowledge. Instead of just bashing the return type, we swap the helper call.

## Part 2

Native type handle equality checks need to go through a helper, unless the EE side says it's okay to compare native type handles directly.

2 files changed, 6 insertions, 0 deletions

diff --git a/src/zap/zapinfo.cpp b/src/zap/zapinfo.cpp
index e0acd819c9..b94809f45e 100644
--- a/src/zap/zapinfo.cpp
+++ b/src/zap/zapinfo.cpp
@@ -3073,6 +3073,11 @@ BOOL ZapInfo::isValueClass(CORINFO_CLASS_HANDLE cls)
     return m_pEEJitInfo->isValueClass(cls);
 }
 
+CorInfoInlineTypeCheck ZapInfo::canInlineTypeCheck (CORINFO_CLASS_HANDLE cls, CorInfoInlineTypeCheckSource source)
+{
+    return m_pEEJitInfo->canInlineTypeCheck(cls, source);
+}
+
 BOOL ZapInfo::canInlineTypeCheckWithObjectVTable (CORINFO_CLASS_HANDLE cls)
 {
     return m_pEEJitInfo->canInlineTypeCheckWithObjectVTable(cls);
diff --git a/src/zap/zapinfo.h b/src/zap/zapinfo.h
index ded4d53923..0e4a84eb4c 100644
--- a/src/zap/zapinfo.h
+++ b/src/zap/zapinfo.h
@@ -521,6 +521,7 @@ public:
                                   BOOL fFullInst,
                                   BOOL fAssembly);
     BOOL isValueClass(CORINFO_CLASS_HANDLE clsHnd);
+    CorInfoInlineTypeCheck canInlineTypeCheck(CORINFO_CLASS_HANDLE cls, CorInfoInlineTypeCheckSource source);
     BOOL canInlineTypeCheckWithObjectVTable(CORINFO_CLASS_HANDLE clsHnd);
     DWORD getClassAttribs(CORINFO_CLASS_HANDLE cls);
     BOOL isStructRequiringStackAllocRetBuf(CORINFO_CLASS_HANDLE cls);