[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/setcc-opt.ll b/llvm/test/CodeGen/R600/setcc-opt.ll
index 93860f5..0219cdb 100644
--- a/llvm/test/CodeGen/R600/setcc-opt.ll
+++ b/llvm/test/CodeGen/R600/setcc-opt.ll
@@ -162,7 +162,7 @@
 ; GCN-NEXT: buffer_store_byte [[RESULT]]
 ; GCN: s_endpgm
 define void @cmp_sext_k_neg1(i1 addrspace(1)* %out, i8 addrspace(1)* %b.ptr) nounwind {
-  %b = load i8 addrspace(1)* %b.ptr
+  %b = load i8, i8 addrspace(1)* %b.ptr
   %b.ext = sext i8 %b to i32
   %icmp0 = icmp ne i32 %b.ext, -1
   store i1 %icmp0, i1 addrspace(1)* %out