[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/Transforms/ScalarRepl/union-fp-int.ll b/llvm/test/Transforms/ScalarRepl/union-fp-int.ll
index 6a49918..fa64b60 100644
--- a/llvm/test/Transforms/ScalarRepl/union-fp-int.ll
+++ b/llvm/test/Transforms/ScalarRepl/union-fp-int.ll
@@ -8,7 +8,7 @@
 	%X_addr = alloca float		; <float*> [#uses=2]
 	store float %X, float* %X_addr
 	%X_addr.upgrd.1 = bitcast float* %X_addr to i32*		; <i32*> [#uses=1]
-	%tmp = load i32* %X_addr.upgrd.1		; <i32> [#uses=1]
+	%tmp = load i32, i32* %X_addr.upgrd.1		; <i32> [#uses=1]
 	ret i32 %tmp
 }