[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/R600/fabs.f64.ll b/llvm/test/CodeGen/R600/fabs.f64.ll
index 30c8952..3c6136c 100644
--- a/llvm/test/CodeGen/R600/fabs.f64.ll
+++ b/llvm/test/CodeGen/R600/fabs.f64.ll
@@ -14,7 +14,7 @@
   %tid = call i32 @llvm.r600.read.tidig.x() nounwind readnone
   %tidext = sext i32 %tid to i64
   %gep = getelementptr double, double addrspace(1)* %in, i64 %tidext
-  %val = load double addrspace(1)* %gep, align 8
+  %val = load double, double addrspace(1)* %gep, align 8
   %fabs = call double @llvm.fabs.f64(double %val)
   store double %fabs, double addrspace(1)* %out
   ret void