gdb.trace: Surround $call_insn with \y in entry-values.exp

The PPC64 tracepoint patch added \y at the end of the call_insn pattern -
without that, it embarassed itself and matched the 'bl' in "Dump of
assem*bl*er code for function" as the powerpc call opcode.  Since that
sounds like a generally good idea, I've added \y before and after
call_insn for every target.  As a result, I had to change x86_64's mnemonic
to 'callq'.

gdb/testsuite/ChangeLog:

	* gdb.trace/entry-values.exp: Surround $call_insn with '\y',
	change x86_64 call_insn to 'callq'.

gdb/testsuite/ChangeLog

+2016-02-25  Marcin Kościelnicki  <koriakin@0x04.net>
+
+	* gdb.trace/entry-values.exp: Surround $call_insn with '\y',
+	change x86_64 call_insn to 'callq'.
+
 2016-02-24  Antoine Tremblay  <antoine.tremblay@ericsson.com>
 
 	* gdb.trace/tfile-avx.c: Move to...

gdb/testsuite/gdb.trace/entry-values.exp

@@ -57,6 +57,8 @@ if { [istarget "arm*-*-*"] || [istarget "aarch64*-*-*"] } {
     # returns.  The only exception is JALRC, in which case execution
     # resumes from `insn1' instead.
     set call_insn {jalrc|[jb]al[sxr]*[ \t][^\r\n]+\r\n}
+} elseif [is_amd64_regs_target] {
+    set call_insn "callq"
 } else {
     set call_insn "call"
 }
@@ -64,7 +66,7 @@ if { [istarget "arm*-*-*"] || [istarget "aarch64*-*-*"] } {
 # Calculate the offset of the instruction in bar returned from foo.
 set test "disassemble bar"
 gdb_test_multiple $test $test {
-    -re ".*$hex <\\+$decimal>:\[ \t\]+$call_insn\[^\r\n\]+\r\n\[ \]+$hex <\\+($decimal)>:.*$gdb_prompt $" {
+    -re ".*$hex <\\+$decimal>:\[ \t\]+\\y$call_insn\\y\[^\r\n\]+\r\n\[ \]+$hex <\\+($decimal)>:.*$gdb_prompt $" {
 	set returned_from_foo $expect_out(1,string)
     }
     -re ".*$gdb_prompt $" {