[compiler-rt] Update test to export variables instead of using env

To work around a bug in lit's internal test runner around ulimit.
Commands that use env to set environment variables for that command do
not have limits applied to them. This needs to be fixed, but for now we
can work around without degrading the readability of the test too much.

Author: boomanaiden154

compiler-rt/test/asan/TestCases/Linux/allocator_oom_test.cpp

@@ -7,25 +7,37 @@
 // Limit this test to Linux since we're relying on allocator internal
 // limits (shadow memory size, allocation limits etc.)
 
+// TODO(boomanaiden154): Switch back to using env options instead of explicitly
+// exporting when the underlying bug causing ulimits to not apply to run lines
+// that use env options is fixed.
+
 // RUN: %clangxx_asan -O0 %s -o %t
 // RUN: ulimit -v 22024290304
 // RUN: not %run %t malloc 2>&1 \
 // RUN:   | FileCheck %s --check-prefixes=CHECK-MALLOC,CHECK-CRASH
-// RUN: %env_asan_opts=allocator_may_return_null=0 not %run %t malloc 2>&1 \
+// RUN: %export_asan_opts=allocator_may_return_null=0
+// RUN: not %run %t malloc 2>&1 \
 // RUN:   | FileCheck %s --check-prefixes=CHECK-MALLOC,CHECK-CRASH
-// RUN: %env_asan_opts=allocator_may_return_null=1     %run %t malloc 2>&1 \
+// RUN: %export_asan_opts=allocator_may_return_null=1
+// RUN: %run %t malloc 2>&1 \
 // RUN:   | FileCheck %s --check-prefixes=CHECK-MALLOC,CHECK-NULL
-// RUN: %env_asan_opts=allocator_may_return_null=0 not %run %t calloc 2>&1 \
+// RUN: %export_asan_opts=allocator_may_return_null=0
+// RUN: not %run %t calloc 2>&1 \
 // RUN:   | FileCheck %s --check-prefixes=CHECK-CALLOC,CHECK-CRASH
-// RUN: %env_asan_opts=allocator_may_return_null=1     %run %t calloc 2>&1 \
+// RUN: %export_asan_opts=allocator_may_return_null=1
+// RUN: %run %t calloc 2>&1 \
 // RUN:   | FileCheck %s --check-prefixes=CHECK-CALLOC,CHECK-NULL
-// RUN: %env_asan_opts=allocator_may_return_null=0 not %run %t realloc 2>&1 \
+// RUN: %export_asan_opts=allocator_may_return_null=0
+// RUN: not %run %t realloc 2>&1 \
 // RUN:   | FileCheck %s --check-prefixes=CHECK-REALLOC,CHECK-CRASH
-// RUN: %env_asan_opts=allocator_may_return_null=1     %run %t realloc 2>&1 \
+// RUN: %export_asan_opts=allocator_may_return_null=1
+// RUN: %run %t realloc 2>&1 \
 // RUN:   | FileCheck %s --check-prefixes=CHECK-REALLOC,CHECK-NULL
-// RUN: %env_asan_opts=allocator_may_return_null=0 not %run %t realloc-after-malloc 2>&1 \
+// RUN: %export_asan_opts=allocator_may_return_null=0
+// RUN: not %run %t realloc-after-malloc 2>&1 \
 // RUN:   | FileCheck %s --check-prefixes=CHECK-MALLOC-REALLOC,CHECK-CRASH
-// RUN: %env_asan_opts=allocator_may_return_null=1     %run %t realloc-after-malloc 2>&1 \
+// RUN: %export_asan_opts=allocator_may_return_null=1
+// RUN: %run %t realloc-after-malloc 2>&1 \
 // RUN:   | FileCheck %s --check-prefixes=CHECK-MALLOC-REALLOC,CHECK-NULL
 
 // ASan shadow memory on s390 is too large for this test.