Allow integer_overflow sanitizer path exclusion.

Add support for excluding paths from having integer_overflow applied to
them when using SANITIZE_TARGET=integer_overflow via an
INTEGER_OVERFLOW_EXCLUDE_PATHS make and product variable. This covers
the make side of the change.

Bug: 30969751
Test: Build with SANITIZE_TARGET=integer_overflow
SANITIZE_TARGET_DIAG=integer_overflow
INTEGER_OVERFLOW_EXCLUDE_PATHS=<path> and confirmed this was no
longer being applied to binaries in that path.

Change-Id: I24e328257bc5a7962024c8676a1e23d7d70a8666
diff --git a/core/product.mk b/core/product.mk
index 5e943ce..c5ddf81 100644
--- a/core/product.mk
+++ b/core/product.mk
@@ -135,6 +135,7 @@
     PRODUCT_IOT \
     PRODUCT_SYSTEM_HEADROOM \
     PRODUCT_MINIMIZE_JAVA_DEBUG_INFO \
+    PRODUCT_INTEGER_OVERFLOW_EXCLUDE_PATHS \