Reapply 63765.  Patches for clang and llvm-gcc to follow.

llvm-svn: 63812
diff --git a/llvm/lib/VMCore/Function.cpp b/llvm/lib/VMCore/Function.cpp
index bda2eff..bc3b611 100644
--- a/llvm/lib/VMCore/Function.cpp
+++ b/llvm/lib/VMCore/Function.cpp
@@ -175,7 +175,7 @@
     ParentModule->getFunctionList().push_back(this);
 
   // Ensure intrinsics have the right parameter attributes.
-  if (unsigned IID = getIntrinsicID(true))
+  if (unsigned IID = getIntrinsicID())
     setAttributes(Intrinsic::getAttributes(Intrinsic::ID(IID)));
 
 }
@@ -304,7 +304,7 @@
 /// particular intrinsic functions which correspond to this value are defined in
 /// llvm/Intrinsics.h.
 ///
-unsigned Function::getIntrinsicID(bool noAssert) const {
+unsigned Function::getIntrinsicID() const {
   const ValueName *ValName = this->getValueName();
   if (!ValName)
     return 0;
@@ -315,12 +315,9 @@
       || Name[2] != 'v' || Name[3] != 'm')
     return 0;  // All intrinsics start with 'llvm.'
 
-  assert((Len != 5 || noAssert) && "'llvm.' is an invalid intrinsic name!");
-
 #define GET_FUNCTION_RECOGNIZER
 #include "llvm/Intrinsics.gen"
 #undef GET_FUNCTION_RECOGNIZER
-  assert(noAssert && "Invalid LLVM intrinsic name");
   return 0;
 }
 
@@ -373,4 +370,9 @@
                                           getType(id, Tys, numTys)));
 }
 
+// This defines the "Intrinsic::getIntrinsicForGCCBuiltin()" method.
+#define GET_LLVM_INTRINSIC_FOR_GCC_BUILTIN
+#include "llvm/Intrinsics.gen"
+#undef GET_LLVM_INTRINSIC_FOR_GCC_BUILTIN
+
 // vim: sw=2 ai