[Pal/Linux-SGX] Rename .Lhandle_resume to .Lprepare_resume

This code path is called when the urts EENTERs to allow us to prepare
the SSA for the following ERESUME (i.e. inject the exception handler).
It is not for the ERESUME itself. So rename it to avoid confusion.

Pal/src/host/Linux-SGX/enclave_entry.S

@@ -22,7 +22,7 @@ enclave_entry:
 	cld
 
 	cmpq $0, %rax
-	jne .Lhandle_resume
+	jne .Lprepare_resume
 
 	movq %rcx, %gs:SGX_AEP
 
@@ -42,7 +42,7 @@ enclave_entry:
 	# to deceive the trusted PAL.
 
 	# This thread can be interrupted but then the above check branches to
-	# .Lhandle_resume. So the outside can't re-enter the checks below in
+	# .Lprepare_resume. So the outside can't re-enter the checks below in
 	# the middle.
 
 	# Only jump to .Lreturn_from_ocall if we have prepared the stack for
@@ -95,13 +95,13 @@ enclave_entry:
 	# handle_ecall will only return when invalid parameters has been passed.
 	FAIL_LOOP
 
-.Lhandle_resume:
+.Lprepare_resume:
 	# PAL convention:
 	# RDI - external event
 
 	# Nested exceptions at the host-OS level are disallowed:
 	# - Synchronous exceptions are assumed to never happen during
-	#   handle_resume;
+	#   prepare_resume;
 	# - Asynchronous signals are not nested by benign host OS because
 	#   we mask asynchronous signals on signal handler.
 	# If malicious host OS injects a nested signal, CSSA != 1 and we