Implement the segue optimization for LLVM AOT/JIT (#2230)

Segue is an optimization technology which uses x86 segment register to store
the WebAssembly linear memory base address, so as to remove most of the cost
of SFI (Software-based Fault Isolation) base addition and free up a general
purpose register, by this way it may:
- Improve the performance of JIT/AOT
- Reduce the footprint of JIT/AOT, the JIT/AOT code generated is smaller
- Reduce the compilation time of JIT/AOT

This PR uses the x86-64 GS segment register to apply the optimization, currently
it supports linux and linux-sgx platforms on x86-64 target. By default it is disabled,
developer can use the option below to enable it for wamrc and iwasm(with LLVM
JIT enabled):
```bash
wamrc --enable-segue=[<flags>] -o output_file wasm_file
iwasm --enable-segue=[<flags>] wasm_file [args...]
```
`flags` can be:
    i32.load, i64.load, f32.load, f64.load, v128.load,
    i32.store, i64.store, f32.store, f64.store, v128.store
Use comma to separate them, e.g. `--enable-segue=i32.load,i64.store`,
and `--enable-segue` means all flags are added.

Acknowledgement:
Many thanks to Intel Labs, UC San Diego and UT Austin teams for introducing this
technology and the great support and guidance!

Signed-off-by: Wenyong Huang <wenyong.huang@intel.com>
Co-authored-by: Vahldiek-oberwagner, Anjo Lucas <anjo.lucas.vahldiek-oberwagner@intel.com>

tests/benchmarks/sightglass/build.sh

@@ -3,6 +3,8 @@
 # Copyright (C) 2019 Intel Corporation.  All rights reserved.
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 
+PLATFORM=$(uname -s | tr A-Z a-z)
+
 OUT_DIR=$PWD/out
 WAMRC_CMD=$PWD/../../../wamr-compiler/build/wamrc
 SHOOTOUT_CASES="base64 fib2 gimli heapsort matrix memmove nestedloop \
@@ -34,9 +36,12 @@ do
         -Wl,--export=app_main -Wl,--export=_start \
         ${bench}.c main/main_${bench}.c main/my_libc.c
 
-
     echo "Compile ${bench}.wasm into ${bench}.aot"
     ${WAMRC_CMD} -o ${OUT_DIR}/${bench}.aot ${OUT_DIR}/${bench}.wasm
+    if [[ ${PLATFORM} == "linux" ]]; then
+        echo "Compile ${bench}.wasm into ${bench}_segue.aot"
+        ${WAMRC_CMD} --enable-segue -o ${OUT_DIR}/${bench}_segue.aot ${OUT_DIR}/${bench}.wasm
+    fi
 done
 
 cd ..

tests/benchmarks/sightglass/run_aot.sh

@@ -36,7 +36,11 @@ echo "Start to run cases, the result is written to report.txt"
 
 #run benchmarks
 cd $OUT_DIR
-echo -en "\t\t\t\t\t  native\tiwasm-aot\n" >> $REPORT
+if [[ ${PLATFORM} == "linux" ]]; then
+    echo -en "\t\t\t\t\t  native\tiwasm-aot\tiwasm-aot-segue\n" >> $REPORT
+else
+    echo -en "\t\t\t\t\t  native\tiwasm-aot\n" >> $REPORT
+fi
 
 for t in $SHOOTOUT_CASES
 do
@@ -50,5 +54,11 @@ do
     echo -en "\t" >> $REPORT
     $TIME -f "real-%e-time" $IWASM_CMD ${t}.aot 2>&1 | grep "real-.*-time" | awk -F '-' '{ORS=""; print $2}' >> $REPORT
 
+    if [[ ${PLATFORM} == "linux" ]]; then
+        echo "run $t with iwasm aot segue .."
+        echo -en "\t" >> $REPORT
+        $TIME -f "real-%e-time" $IWASM_CMD ${t}_segue.aot 2>&1 | grep "real-.*-time" | awk -F '-' '{ORS=""; print $2}' >> $REPORT
+    fi
+
     echo -en "\n" >> $REPORT
 done

tests/benchmarks/sightglass/run_interp.sh

@@ -46,9 +46,9 @@ do
     echo -en "\t" >> $REPORT
     $TIME -f "real-%e-time" ./${t}_native 2>&1 | grep "real-.*-time" | awk -F '-' '{ORS=""; print $2}' >> $REPORT
 
-    echo "run $t with iwasm aot .."
+    echo "run $t with iwasm interp .."
     echo -en "\t" >> $REPORT
-    $TIME -f "real-%e-time" $IWASM_CMD ${t}.aot 2>&1 | grep "real-.*-time" | awk -F '-' '{ORS=""; print $2}' >> $REPORT
+    $TIME -f "real-%e-time" $IWASM_CMD ${t}.wasm 2>&1 | grep "real-.*-time" | awk -F '-' '{ORS=""; print $2}' >> $REPORT
 
     echo -en "\n" >> $REPORT
 done