[CodeGen] Fix performance regression introduced in b05101b

The isNormalValueType = false flag was not set for this pseudo value
type, which caused significant size increases for some classes: the
size of the TargetLoweringBase class to 1.5 MB, because the size of
that class is quadratic in MVT::VALUETYPE_SIZE, and this commit
increased that from 256 to 504.

Reported by: abadams
Fixes: b05101b ("[TableGen, CodeGen, CHERI] Add support for the cPTR wildcard value type.")

Reviewed By: nikic

Pull Request: llvm#161313

Author: arichardson

llvm/include/llvm/CodeGen/ValueTypes.td

@@ -367,11 +367,11 @@ def aarch64mfp8 : ValueType<8,  253>;  // 8-bit value in FPR (AArch64)
 def c64 : VTCheriCapability<64, 254>;   // 64-bit CHERI capability value
 def c128 : VTCheriCapability<128, 255>; // 128-bit CHERI capability value
 
+let isNormalValueType = false in {
 // Pseudo valuetype mapped to the current CHERI capability pointer size.
 // Should only be used in TableGen.
 def cPTR : VTAny<503>;
 
-let isNormalValueType = false in {
 def token      : ValueType<0, 504>;  // TokenTy
 def MetadataVT : ValueType<0, 505> { // Metadata
   let LLVMName = "Metadata";