x86, flags: Rename X86_EFLAGS_BIT1 to X86_EFLAGS_FIXED

Bit 1 in the x86 EFLAGS is always set.  Name the macro something that
actually tries to explain what it is all about, rather than being a
tautology.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Gleb Natapov <gleb@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Link: http://lkml.kernel.org/n/tip-f10rx5vjjm6tfnt8o1wseb3v@git.kernel.org
diff --git a/drivers/lguest/x86/core.c b/drivers/lguest/x86/core.c
index f0a3347..5169239 100644
--- a/drivers/lguest/x86/core.c
+++ b/drivers/lguest/x86/core.c
@@ -700,7 +700,7 @@
 	 * interrupts are enabled.  We always leave interrupts enabled while
 	 * running the Guest.
 	 */
-	regs->eflags = X86_EFLAGS_IF | X86_EFLAGS_BIT1;
+	regs->eflags = X86_EFLAGS_IF | X86_EFLAGS_FIXED;
 
 	/*
 	 * The "Extended Instruction Pointer" register says where the Guest is