Revert "Update darwin clang prebuilts to be 64-bit."

This reverts commit dd73bf00de3f279e5e4d1b120fe3783bfde20df0.

Change-Id: I2a9979a35733f629515db075e1797f2737126ecf
diff --git a/bin/clang b/bin/clang
index 7042d9b..fa0f019 100755
--- a/bin/clang
+++ b/bin/clang
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diff --git a/bin/llvm-as b/bin/llvm-as
index 94e820d..897ccdd 100755
--- a/bin/llvm-as
+++ b/bin/llvm-as
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diff --git a/bin/llvm-link b/bin/llvm-link
index 6674064..00c82b8 100755
--- a/bin/llvm-link
+++ b/bin/llvm-link
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diff --git a/lib/libc++.dylib b/lib/libc++.dylib
index f81f599..9b3c62d 100755
--- a/lib/libc++.dylib
+++ b/lib/libc++.dylib
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