[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/m0-spill.ll b/llvm/test/CodeGen/R600/m0-spill.ll
index 37bc10a..1dddc85 100644
--- a/llvm/test/CodeGen/R600/m0-spill.ll
+++ b/llvm/test/CodeGen/R600/m0-spill.ll
@@ -13,7 +13,7 @@
 
 if:
   %lds_ptr = getelementptr [64 x float], [64 x float] addrspace(3)* @lds, i32 0, i32 0
-  %lds_data = load float addrspace(3)* %lds_ptr
+  %lds_data = load float, float addrspace(3)* %lds_ptr
   br label %endif
 
 else: