[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/PowerPC/fastisel-gep-promote-before-add.ll b/llvm/test/CodeGen/PowerPC/fastisel-gep-promote-before-add.ll
index fdedc5d..96cf67c 100644
--- a/llvm/test/CodeGen/PowerPC/fastisel-gep-promote-before-add.ll
+++ b/llvm/test/CodeGen/PowerPC/fastisel-gep-promote-before-add.ll
@@ -6,12 +6,12 @@
 entry:
   %ptr.addr = alloca i8*, align 8
   %add = add i8 64, 64 ; 0x40 + 0x40
-  %0 = load i8** %ptr.addr, align 8
+  %0 = load i8*, i8** %ptr.addr, align 8
 
   ; CHECK-LABEL: gep_promotion:
   ; CHECK: lbz {{[0-9]+}}, 0({{.*}})
   %arrayidx = getelementptr inbounds i8, i8* %0, i8 %add
 
-  %1 = load i8* %arrayidx, align 1
+  %1 = load i8, i8* %arrayidx, align 1
   ret i8 %1
 }