[mips][FastISel] Remove hidden mips-fast-isel option.

Summary:
This hidden option would disable code generation through FastISel by
default. It was removed from the available options and from the
Fast-ISel tests that required it in order to run the tests.

Reviewers: dsanders

Subscribers: qcolombet, llvm-commits

Differential Revision: http://reviews.llvm.org/D11610

llvm-svn: 243638
diff --git a/llvm/test/CodeGen/Mips/Fast-ISel/loadstrconst.ll b/llvm/test/CodeGen/Mips/Fast-ISel/loadstrconst.ll
index 9f644ec..1051b28 100644
--- a/llvm/test/CodeGen/Mips/Fast-ISel/loadstrconst.ll
+++ b/llvm/test/CodeGen/Mips/Fast-ISel/loadstrconst.ll
@@ -1,6 +1,6 @@
-; RUN: llc -march=mipsel -relocation-model=pic -O0 -mips-fast-isel -fast-isel-abort=1 -mcpu=mips32r2 \
+; RUN: llc -march=mipsel -relocation-model=pic -O0 -fast-isel-abort=1 -mcpu=mips32r2 \
 ; RUN:     < %s | FileCheck %s
-; RUN: llc -march=mipsel -relocation-model=pic -O0 -mips-fast-isel -fast-isel-abort=1 -mcpu=mips32 \
+; RUN: llc -march=mipsel -relocation-model=pic -O0 -fast-isel-abort=1 -mcpu=mips32 \
 ; RUN:     < %s | FileCheck %s
 
 @.str = private unnamed_addr constant [6 x i8] c"hello\00", align 1