Switch to larger TOC on AIX for unitttests

test/unittests/unittests.gyp

Index: test/unittests/unittests.gyp
diff --git a/test/unittests/unittests.gyp b/test/unittests/unittests.gyp
index 25644f2997045a59f55ebb7594c79bf49c247cb3..7b1c3b00c8491f99df23c593cc2eef10e3380954 100644
--- a/test/unittests/unittests.gyp
+++ b/test/unittests/unittests.gyp
@@ -126,6 +126,9 @@
             'compiler/ppc/instruction-selector-ppc-unittest.cc',
           ],
         }],
+        ['OS=="aix"', {
+          'ldflags': [ '-Wl,-bbigtoc' ],
+        }],
         ['component=="shared_library"', {
           # compiler-unittests can't be built against a shared library, so we
           # need to depend on the underlying static target in that case.