Increase limit for OpActions array

The OpActions array had a limit of 32 value types, so change it to use
MVT::MAX_ALLOWED_VALUETYPE in its declaration and change the accesses to
this array to work with a VT.getSimpleVT() that is larger than 32.

Also, add a comment to the place where MVT::MAX_ALLOWED_VALUETYPE is
defined indicating that it must be a multiple of 32.

This is part of the work allow MVT::LAST_VALUETYPE be greater than 32.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74130 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/CodeGen/ValueTypes.h

@@ -76,6 +76,7 @@ namespace llvm {
       // This is the current maximum for LAST_VALUETYPE.
       // Affects ValueTypeActions in TargetLowering.h.
       // MVT::MAX_ALLOWED_VALUETYPE is used for asserts and to size bit vectors
+      // This value must be a multiple of 32.
       MAX_ALLOWED_VALUETYPE = 64,
 
       // iPTRAny - An int value the size of the pointer of the current