[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/fp-double-rounding.ll b/llvm/test/CodeGen/X86/fp-double-rounding.ll
index 030cb9a..c7578ac 100644
--- a/llvm/test/CodeGen/X86/fp-double-rounding.ll
+++ b/llvm/test/CodeGen/X86/fp-double-rounding.ll
@@ -11,7 +11,7 @@
 ; UNSAFE-NOT: cvt
 define void @double_rounding(fp128* %x, float* %f) {
 entry:
-  %0 = load fp128* %x, align 16
+  %0 = load fp128, fp128* %x, align 16
   %1 = fptrunc fp128 %0 to double
   %2 = fptrunc double %1 to float
   store float %2, float* %f, align 4