[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/SystemZ/fp-mul-05.ll b/llvm/test/CodeGen/SystemZ/fp-mul-05.ll
index 0be1fe8..48d0dcd 100644
--- a/llvm/test/CodeGen/SystemZ/fp-mul-05.ll
+++ b/llvm/test/CodeGen/SystemZ/fp-mul-05.ll
@@ -12,7 +12,7 @@
 ; CHECK: std %f1, 0(%r2)
 ; CHECK: std %f3, 8(%r2)
 ; CHECK: br %r14
-  %f1 = load fp128 *%ptr
+  %f1 = load fp128 , fp128 *%ptr
   %f2x = fpext float %f2 to fp128
   %diff = fmul fp128 %f1, %f2x
   store fp128 %diff, fp128 *%ptr