[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/ia-mem-r0.ll b/llvm/test/CodeGen/PowerPC/ia-mem-r0.ll
index 0ce6cc8..a007fc1 100644
--- a/llvm/test/CodeGen/PowerPC/ia-mem-r0.ll
+++ b/llvm/test/CodeGen/PowerPC/ia-mem-r0.ll
@@ -84,10 +84,10 @@
   %52 = bitcast i8* %51 to i64*
   call void asm sideeffect "std  31, $0", "=*m"(i64* %52)
   %53 = getelementptr { i8*, void (i8*, i8*)* }, { i8*, void (i8*, i8*)* }* %fn, i32 0, i32 1
-  %.funcptr = load void (i8*, i8*)** %53
+  %.funcptr = load void (i8*, i8*)*, void (i8*, i8*)** %53
   %54 = getelementptr { i8*, void (i8*, i8*)* }, { i8*, void (i8*, i8*)* }* %fn, i32 0, i32 0
-  %.ptr = load i8** %54
-  %55 = load i8** %sp
+  %.ptr = load i8*, i8** %54
+  %55 = load i8*, i8** %sp
   call void %.funcptr(i8* %.ptr, i8* %55)
   ret void
 }