Revert "[Coverage] Store compilation dir separately in coverage mapping"

This reverts commit 97ec8fa5bb07e3f5bf25ddcb216b545cd3d03b65 since
the test is failing on some bots.

GitOrigin-RevId: fbf8b957fdc1d421f86049669a9af6cd2c05971d
diff --git a/include/profile/InstrProfData.inc b/include/profile/InstrProfData.inc
index 9112c9f..3ee7af7 100644
--- a/include/profile/InstrProfData.inc
+++ b/include/profile/InstrProfData.inc
@@ -649,7 +649,7 @@
 /* Indexed profile format version (start from 1). */
 #define INSTR_PROF_INDEX_VERSION 7
 /* Coverage mapping format version (start from 0). */
-#define INSTR_PROF_COVMAP_VERSION 5
+#define INSTR_PROF_COVMAP_VERSION 4
 
 /* Profile version is always of type uint64_t. Reserve the upper 8 bits in the
  * version for other variants of profile. We set the lowest bit of the upper 8