tracing: Add BUILD_BUG() to make sure stacktrace fits in strings

The max string length for a histogram variable is 256 bytes. The max depth
of a stacktrace is 16. With 8byte words, that's 16 * 8 = 128. Which can
easily fit in the string variable. The histogram stacktrace is being
stored in the string value (with the given max length), with the
assumption it will fit. To make sure that this is always the case (in the
case that the stack trace depth increases), add a BUILD_BUG_ON() to test
this.

Link: https://lore.kernel.org/linux-trace-kernel/[email protected]/

Signed-off-by: Steven Rostedt (Google) <[email protected]>

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