[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/X86/expand-opaque-const.ll b/llvm/test/CodeGen/X86/expand-opaque-const.ll
index 6e461cf..1e39cd8 100644
--- a/llvm/test/CodeGen/X86/expand-opaque-const.ll
+++ b/llvm/test/CodeGen/X86/expand-opaque-const.ll
@@ -11,11 +11,11 @@
   %op2 = alloca i64
   store i64 -6687208052682386272, i64* %op1
   store i64 7106745059734980448, i64* %op2
-  %tmp1 = load i64* %op1
-  %tmp2 = load i64* %op2
+  %tmp1 = load i64, i64* %op1
+  %tmp2 = load i64, i64* %op2
   %tmp = xor i64 %tmp2, 7106745059734980448
   %tmp3 = lshr i64 %tmp1, %tmp
   store i64 %tmp3, i64* %retval
-  %tmp4 = load i64* %retval
+  %tmp4 = load i64, i64* %retval
   ret i64 %tmp4
 }