[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/zero-not-run.ll b/llvm/test/CodeGen/PowerPC/zero-not-run.ll
index 9df0d6e..b3b7634 100644
--- a/llvm/test/CodeGen/PowerPC/zero-not-run.ll
+++ b/llvm/test/CodeGen/PowerPC/zero-not-run.ll
@@ -8,7 +8,7 @@
   br i1 undef, label %for.body, label %for.end731
 
 for.body:                                         ; preds = %entry
-  %0 = load i32* undef, align 4
+  %0 = load i32, i32* undef, align 4
   %or31 = or i32 %0, 319143828
   store i32 %or31, i32* undef, align 4
   %cmp32 = icmp eq i32 319143828, %or31