[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/Generic/2006-02-12-InsertLibcall.ll b/llvm/test/CodeGen/Generic/2006-02-12-InsertLibcall.ll
index 5508272..8a43b6a 100644
--- a/llvm/test/CodeGen/Generic/2006-02-12-InsertLibcall.ll
+++ b/llvm/test/CodeGen/Generic/2006-02-12-InsertLibcall.ll
@@ -42,7 +42,7 @@
 	ret void
 
 else.1.i56:		; preds = %then.0.i40
-	%tmp.28.i = load i32* @G		; <i32> [#uses=1]
+	%tmp.28.i = load i32, i32* @G		; <i32> [#uses=1]
 	%tmp.29.i = icmp eq i32 %tmp.28.i, 1		; <i1> [#uses=1]
 	br i1 %tmp.29.i, label %shortcirc_next.i, label %shortcirc_done.i