testsuite, mi: avoid a clang bug in 'user-selected-context-sync.exp'

testsuite, mi: avoid a clang bug in 'user-selected-context-sync.exp'

This test causes several timeouts for Clang, taking too long time to
finish.  The reason is, for an infinite loop of the form

   while(1); /* suppose this is line 30.  */

Clang generates code that looks like

   0x00000000004004d4 <+4>:     jmp    0x4004d9 <loop+9>
   0x00000000004004d9 <+9>:     jmp    0x4004d9 <loop+9>

So, the real loop is the instruction at address 0x4004d9.  But a
breakpoint that's defined at the loop line (assume line 30 in this
case) is inserted at address 0x4004d4.

  (gdb) break 30
  Breakpoint 1 at 0x4004d4: file test.c, line 30.

Therefore, continuing a thread that was spinning on the loop does not hit
the breakpoint.  The bug is reported at

  https://bugs.llvm.org/show_bug.cgi?id=49614

Tweak the infinite loop to spin on a variable to avoid this bug.  The
test is unrelated to the bug.

gdb/testsuite/ChangeLog:
2021-03-29  Tankut Baris Aktemur  <tankut.baris.aktemur@intel.com>

	* gdb.mi/user-selected-context-sync.exp: Spin on a variable in
	the infinite loop to avoid a Clang bug.