[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/Mips/eh.ll b/llvm/test/CodeGen/Mips/eh.ll
index fc9e2ef..03bc199 100644
--- a/llvm/test/CodeGen/Mips/eh.ll
+++ b/llvm/test/CodeGen/Mips/eh.ll
@@ -37,7 +37,7 @@
 catch:                                            ; preds = %lpad
   %3 = tail call i8* @__cxa_begin_catch(i8* %exn) nounwind
   %4 = bitcast i8* %3 to double*
-  %exn.scalar = load double* %4, align 8
+  %exn.scalar = load double, double* %4, align 8
   %add = fadd double %exn.scalar, %i2
   store double %add, double* @g1, align 8
   tail call void @__cxa_end_catch() nounwind