PPC/s390: [wasm] Stage type reflection support.

Port e101dfb7

R=mstarzinger@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=v8:7742
LOG=N

Change-Id: I013d461bce61deae032aee08b2b1d9dac591d66a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1774960Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Commit-Queue: Milad Farazmand <miladfar@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#63447}

test/wasm-spec-tests/wasm-spec-tests.status

@@ -52,16 +52,21 @@
   # These tests fail because ppc float min and max doesn't convert sNaN to qNaN.
   'f32': [SKIP],
   'f64': [SKIP],
+  'proposals/js-types/f32': [SKIP],
+  'proposals/js-types/f64': [SKIP],
   # This test fails because ppc float to double doesn't convert sNaN to qNaN.
   'conversions': [SKIP],
   'proposals/reference-types/conversions':  [SKIP],
   'proposals/bulk-memory-operations/conversions': [SKIP],
+  'proposals/js-types/conversions': [SKIP],
 }],  # 'arch == ppc or arch == ppc64'
 
 ['arch == s390 or arch == s390x', {
   # These tests fail because s390 float min and max doesn't convert sNaN to qNaN.
   'f32': [SKIP],
   'f64': [SKIP],
+  'proposals/js-types/f32': [SKIP],
+  'proposals/js-types/f64': [SKIP],
 }],  # 'arch == s390 or arch == s390x'
 
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