[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-be.test

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