[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/2010-12-18-PPCStackRefs.ll b/llvm/test/CodeGen/PowerPC/2010-12-18-PPCStackRefs.ll
index a25ce07..1f320a8 100644
--- a/llvm/test/CodeGen/PowerPC/2010-12-18-PPCStackRefs.ll
+++ b/llvm/test/CodeGen/PowerPC/2010-12-18-PPCStackRefs.ll
@@ -12,11 +12,11 @@
   %0 = alloca i32
   %"alloca point" = bitcast i32 0 to i32
   store i32 0, i32* %0, align 4
-  %1 = load i32* %0, align 4
+  %1 = load i32, i32* %0, align 4
   store i32 %1, i32* %retval, align 4
   br label %return
 
 return:                                           ; preds = %entry
-  %retval1 = load i32* %retval
+  %retval1 = load i32, i32* %retval
   ret i32 %retval1
 }