Revert "[ESan][MIPS] Adds support for MIPS64"

Summary:
This reverts commit 62b3eecdbe72af0255f0639b0446087a47efbf48. (D23799)

The CL cause 13 ESan test failure on x86_64:
Failing Tests (13):
    EfficiencySanitizer-x86_64 :: TestCases/large-stack-linux.c
    EfficiencySanitizer-x86_64 :: TestCases/libc-intercept.c
    EfficiencySanitizer-x86_64 :: TestCases/mmap-shadow-conflict.c
    EfficiencySanitizer-x86_64 :: TestCases/struct-simple.cpp
    EfficiencySanitizer-x86_64 :: TestCases/verbose-simple.c
    EfficiencySanitizer-x86_64 :: TestCases/workingset-early-fault.c
    EfficiencySanitizer-x86_64 :: TestCases/workingset-memset.cpp
    EfficiencySanitizer-x86_64 :: TestCases/workingset-midreport.cpp
    EfficiencySanitizer-x86_64 :: TestCases/workingset-samples.cpp
    EfficiencySanitizer-x86_64 :: TestCases/workingset-signal-posix.cpp
    EfficiencySanitizer-x86_64 :: TestCases/workingset-simple.cpp
    EfficiencySanitizer-x86_64 :: Unit/circular_buffer.cpp
    EfficiencySanitizer-x86_64 :: Unit/hashtable.cpp

  Unexpected Failures: 13

Reviewers: bruening, slthakur

Subscribers: sdardis, kubabrecka, beanz

Differential Revision: https://reviews.llvm.org/D24350

llvm-svn: 280954
diff --git a/compiler-rt/lib/esan/esan_linux.cpp b/compiler-rt/lib/esan/esan_linux.cpp
index 014205c..aa961b6 100644
--- a/compiler-rt/lib/esan/esan_linux.cpp
+++ b/compiler-rt/lib/esan/esan_linux.cpp
@@ -25,7 +25,7 @@
 namespace __esan {
 
 void verifyAddressSpace() {
-#if SANITIZER_LINUX && (defined(__x86_64__) || SANITIZER_MIPS64)
+#if SANITIZER_LINUX && defined(__x86_64__)
   // The kernel determines its mmap base from the stack size limit.
   // Our Linux 64-bit shadow mapping assumes the stack limit is less than a
   // terabyte, which keeps the mmap region above 0x7e00'.