Cherry-pick 259548.25@safari-7615-branch (1a20160). rdar://104692168

    Locals should update max stack size
    rdar://104692168

    Reviewed by Yusuke Suzuki.

    We can forget to update the max stack size, causing an OOB stack read in
    OSR entry. This only happens if you create a bunch of locals and never
    push anything to the stack, so it should be very rare and difficult to
    abuse.

    * JSTests/wasm/stress/many-locals-small-wasm-stack.js: Added.
    (async let):
    * JSTests/wasm/stress/many-locals-small-wasm-stack.wasm: Added.
    * JSTests/wasm/stress/many-locals-small-wasm-stack.wat: Added.
    * Source/JavaScriptCore/wasm/WasmLLIntGenerator.cpp:
    (JSC::Wasm::LLIntGenerator::addLocal):

    Canonical link: https://commits.webkit.org/259548.25@safari-7615-branch

JSTests/wasm/stress/many-locals-small-wasm-stack.js

@@ -0,0 +1,8 @@
+//@ skip
+// This is an infinite loop, so untill watchdog works we have to skip it.
+(async function () {
+  let bytes = readFile('many-locals-small-wasm-stack.wasm', 'binary');
+  let importObject = { };
+  let i = await WebAssembly.instantiate(bytes, importObject);
+  i.instance.exports.main(0n, 0);
+})();

JSTests/wasm/stress/many-locals-small-wasm-stack.wat

@@ -0,0 +1,9 @@
+(module
+  (global $g (mut i32) (i32.const 0))
+  (func $fn16 (export "main") (param $p0 i64) (param $p1 f64)
+    (local $l2 i32) (local $l3 i64) (local $l4 funcref) (local $l5 funcref) (local $l6 funcref) (local $l7 i32) (local $l8 i32) (local $l9 i32) (local $l10 i32) (local $l11 f64) (local $l12 f64) (local $l13 f64) (local $l14 f64) (local $l15 f64) (local $l16 f64) (local $l17 f64) (local $l18 i64) (local $l19 i64) (local $l20 i64) (local $l21 f32) (local $l22 i32) (local $l23 i32) (local $l24 f32) (local $l25 f32) (local $l26 f64) (local $l27 f64) (local $l28 f64) (local $l29 f64) (local $l30 i64) (local $l31 i64) (local $l32 i64) (local $l33 i64) (local $l34 i64)
+    (loop $L0
+      br $L0
+    )
+  )
+)

Source/JavaScriptCore/wasm/WasmLLIntGenerator.cpp

@@ -900,6 +900,8 @@ auto LLIntGenerator::addLocal(Type type, uint32_t count) -> PartialResult
             m_uninitializedLocals.append(push(NoConsistencyCheck));
     } else
         m_stackSize += count;
+    if (m_maxStackSize < m_stackSize)
+        m_maxStackSize = m_stackSize;
     return { };
 }