[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/sgpr-copy-duplicate-operand.ll b/llvm/test/CodeGen/R600/sgpr-copy-duplicate-operand.ll
index 893f5a3..df67fcc 100644
--- a/llvm/test/CodeGen/R600/sgpr-copy-duplicate-operand.ll
+++ b/llvm/test/CodeGen/R600/sgpr-copy-duplicate-operand.ll
@@ -7,7 +7,7 @@
 ; SI-LABEL: {{^}}test_dup_operands:
 ; SI: v_add_i32_e32
 define void @test_dup_operands(<2 x i32> addrspace(1)* noalias %out, <2 x i32> addrspace(1)* noalias %in) {
-  %a = load <2 x i32> addrspace(1)* %in
+  %a = load <2 x i32>, <2 x i32> addrspace(1)* %in
   %lo = extractelement <2 x i32> %a, i32 0
   %hi = extractelement <2 x i32> %a, i32 1
   %add = add i32 %lo, %lo