[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

Essentially the same as the GEP change in r230786.

A similar migration script can be used to update test cases, though a few more
test case improvements/changes were required this time around: (r229269-r229278)

import fileinput
import sys
import re

pat = re.compile(r"((?:=|:|^)\s*load (?:atomic )?(?:volatile )?(.*?))(| addrspace\(\d+\) *)\*($| *(?:%|@|null|undef|blockaddress|getelementptr|addrspacecast|bitcast|inttoptr|\[\[[a-zA-Z]|\{\{).*$)")

for line in sys.stdin:
  sys.stdout.write(re.sub(pat, r"\1, \2\3*\4", line))

Reviewers: rafael, dexonsmith, grosser

Differential Revision: http://reviews.llvm.org/D7649

llvm-svn: 230794
diff --git a/llvm/test/CodeGen/PowerPC/pr18663.ll b/llvm/test/CodeGen/PowerPC/pr18663.ll
index 1b85223..04bc392 100644
--- a/llvm/test/CodeGen/PowerPC/pr18663.ll
+++ b/llvm/test/CodeGen/PowerPC/pr18663.ll
@@ -61,21 +61,21 @@
 
 define void @_ZNK18TriaObjectAccessorILi3ELi3EE10barycenterEv(%class.Point.1* noalias nocapture sret %agg.result, %class.TriaObjectAccessor.57* %this) #0 align 2 {
 entry:
-  %0 = load double* null, align 8
-  %1 = load double* undef, align 8
+  %0 = load double, double* null, align 8
+  %1 = load double, double* undef, align 8
   %call18 = tail call dereferenceable(24) %class.Point.1* @_ZNK18TriaObjectAccessorILi3ELi3EE6vertexEj(%class.TriaObjectAccessor.57* %this, i32 zeroext 6)
-  %2 = load double* undef, align 8
+  %2 = load double, double* undef, align 8
   %call21 = tail call dereferenceable(24) %class.Point.1* @_ZNK18TriaObjectAccessorILi3ELi3EE6vertexEj(%class.TriaObjectAccessor.57* %this, i32 zeroext 7)
-  %3 = load double* undef, align 8
+  %3 = load double, double* undef, align 8
   %call33 = tail call dereferenceable(24) %class.Point.1* @_ZNK18TriaObjectAccessorILi3ELi3EE6vertexEj(%class.TriaObjectAccessor.57* %this, i32 zeroext 3)
-  %4 = load double* null, align 8
-  %5 = load double* undef, align 8
+  %4 = load double, double* null, align 8
+  %5 = load double, double* undef, align 8
   %call45 = tail call dereferenceable(24) %class.Point.1* @_ZNK18TriaObjectAccessorILi3ELi3EE6vertexEj(%class.TriaObjectAccessor.57* %this, i32 zeroext 7)
-  %6 = load double* undef, align 8
+  %6 = load double, double* undef, align 8
   %call48 = tail call dereferenceable(24) %class.Point.1* @_ZNK18TriaObjectAccessorILi3ELi3EE6vertexEj(%class.TriaObjectAccessor.57* %this, i32 zeroext 0)
-  %7 = load double* undef, align 8
+  %7 = load double, double* undef, align 8
   %call66 = tail call dereferenceable(24) %class.Point.1* @_ZNK18TriaObjectAccessorILi3ELi3EE6vertexEj(%class.TriaObjectAccessor.57* %this, i32 zeroext 6)
-  %8 = load double* undef, align 8
+  %8 = load double, double* undef, align 8
   %mul334 = fmul double undef, 2.000000e+00
   %mul579 = fmul double %2, %5
   %mul597 = fmul double undef, %mul579