[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/lds-initializer.ll b/llvm/test/CodeGen/R600/lds-initializer.ll
index 1a80a57..bf8df63 100644
--- a/llvm/test/CodeGen/R600/lds-initializer.ll
+++ b/llvm/test/CodeGen/R600/lds-initializer.ll
@@ -7,7 +7,7 @@
 
 define void @load_init_lds_global(i32 addrspace(1)* %out, i1 %p) {
  %gep = getelementptr [8 x i32], [8 x i32] addrspace(3)* @lds, i32 0, i32 10
-  %ld = load i32 addrspace(3)* %gep
+  %ld = load i32, i32 addrspace(3)* %gep
   store i32 %ld, i32 addrspace(1)* %out
   ret void
 }