[llvm-profdata] Make tests more readable (NFC)

This patch splits a couple of lines of printf into four for
readability so that each corresponds to one field or padding.  They
correspond to NumCounters, NumValueSites, NumBitmapBytes, and padding,
respectively.

llvm/test/tools/llvm-profdata/raw-64-bits-le.test

@@ -19,17 +19,21 @@ RUN: printf '\0\0\4\0\1\0\0\0' >> %t
 RUN: printf '\0\0\4\0\3\0\0\0' >> %t
 RUN: printf '\0\0\0\0\0\0\0\0' >> %t
 RUN: printf '\0\0\0\0\0\0\0\0' >> %t
-RUN: printf '\1\0\0\0\0\0\0\0' >> %t
-RUN: printf '\3\0\0\0\0\0\0\0' >> %t
+RUN: printf '\1\0\0\0' >> %t
+RUN: printf '\0\0\0\0' >> %t
+RUN: printf '\3\0\0\0' >> %t
+RUN: printf '\0\0\0\0' >> %t
 
 RUN: printf '\067\265\035\031\112\165\023\344' >> %t
 RUN: printf '\02\0\0\0\0\0\0\0' >> %t
 RUN: printf '\xc8\xff\3\0\1\0\0\0' >> %t
 RUN: printf '\xc3\xff\3\0\3\0\0\0' >> %t
 RUN: printf '\0\0\0\0\0\0\0\0' >> %t
 RUN: printf '\0\0\0\0\0\0\0\0' >> %t
-RUN: printf '\02\0\0\0\0\0\0\0' >> %t
-RUN: printf '\1\0\0\0\0\0\0\0' >> %t
+RUN: printf '\02\0\0\0' >> %t
+RUN: printf '\0\0\0\0' >> %t
+RUN: printf '\1\0\0\0' >> %t
+RUN: printf '\0\0\0\0' >> %t
 
 RUN: printf '\023\0\0\0\0\0\0\0' >> %t
 RUN: printf '\067\0\0\0\0\0\0\0' >> %t