[LLVM-C] Publicly expose getters of MetadataType, TokenType

[CodaFi]

Summary

Expose getters for MetadataType and TokenType publicly in the C API. Discovered a need for these while trying to wrap the intrinsics API.

[echristo]

Adding in more reviewers. In general I'm fine here, but since they've been in this area much more I'd like to hear from them.

[whitequark]

include/llvm-c/Core.h

1155

We don't add any new functions that operate on global context anymore.

[CodaFi]

Ping @whitequark for a merge. Looks like @deadalnix hasn't been active for a while.

include/llvm-c/Core.h

  */
 LLVMTypeRef LLVMX86MMXTypeInContext(LLVMContextRef C);
 
+/**
+ * Create a token type in a context.
+ */
+LLVMTypeRef LLVMTokenTypeInContext(LLVMContextRef C);
+
+/**
+ * Create a metadata type in a context.
+ */
+LLVMTypeRef LLVMMetadataTypeInContext(LLVMContextRef C);
+
 /**
  * These are similar to the above functions except they operate on the
  * global context.
  */
 LLVMTypeRef LLVMVoidType(void);
 LLVMTypeRef LLVMLabelType(void);
+LLVMTypeRef LLVMTokenType(void);
+LLVMTypeRef LLVMMetadataType(void);
 LLVMTypeRef LLVMX86MMXType(void);
 
 /**

lib/IR/Core.cpp

 LLVMTypeRef LLVMX86MMXTypeInContext(LLVMContextRef C) {
   return (LLVMTypeRef) Type::getX86_MMXTy(*unwrap(C));
 }
-LLVMTypeRef LLVMTokenTypeInContext(LLVMContextRef C) {
-  return (LLVMTypeRef) Type::getTokenTy(*unwrap(C));
-}
 
 LLVMTypeRef LLVMHalfType(void) {
   return LLVMHalfTypeInContext(LLVMGetGlobalContext());

 LLVMTypeRef LLVMLabelTypeInContext(LLVMContextRef C) {
   return wrap(Type::getLabelTy(*unwrap(C)));
 }
+LLVMTypeRef LLVMTokenTypeInContext(LLVMContextRef C) {
+  return wrap(Type::getTokenTy(*unwrap(C)));
+}
+LLVMTypeRef LLVMMetadataTypeInContext(LLVMContextRef C) {
+  return wrap(Type::getMetadataTy(*unwrap(C)));
+}
 
 LLVMTypeRef LLVMVoidType(void)  {
   return LLVMVoidTypeInContext(LLVMGetGlobalContext());

 LLVMTypeRef LLVMLabelType(void) {
   return LLVMLabelTypeInContext(LLVMGetGlobalContext());
 }
+LLVMTypeRef LLVMTokenType(void) {
+  return LLVMTokenTypeInContext(LLVMGetGlobalContext());
+}
+LLVMTypeRef LLVMMetadataType(void) {
+  return LLVMMetadataTypeInContext(LLVMGetGlobalContext());
+}
 
 /*===-- Operations on values ----------------------------------------------===*/
 

tools/llvm-c-test/echo.cpp

           LLVMGetVectorSize(Src)
         );
       case LLVMMetadataTypeKind:
-        break;
+        return LLVMMetadataTypeInContext(Ctx);
       case LLVMX86_MMXTypeKind:
         return LLVMX86MMXTypeInContext(Ctx);
       default: