More fixes for code assuming that libc++ iterators are raw pointers

llvm/llvm-project#74482 changes the iterator
type for std::string_view and std::array so that they're no longer raw
pointers. This CL fixes builds for ChromeOS, MacOS, Android, and iOS.

This CL does *not* fix Windows and Fuchsia - Windows is fixed in
https://crrev.com/c/5362998, and Fuchsia is being fixed upstream.

These changes were tested in a sample libc++ roll in
https://crrev.com/c/5362421.

AX-Relnotes: n/a
Bug: 328308661
Change-Id: I7681d93b8b59a389c6c349821d25c3c93cb87bc1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5365796
Reviewed-by: Nico Weber <[email protected]>
Owners-Override: Nico Weber <[email protected]>
Commit-Queue: Alan Zhao <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1272559}
NOKEYCHECK=True
GitOrigin-RevId: 9b60fb150439bf1170ab74f6230169b48aff1c07

Author: alanzhao1

debug/allocation_trace_unittest.cc

@@ -350,12 +350,12 @@ class OperationRecordTest : public Test {
     // to inline, depending i.e. on the optimization level. Therefore, we search
     // for the first common frame in both stack-traces. From there on, both must
     // be equal for the remaining number of frames.
-    auto* const* const it_stack_trace_begin = std::begin(stack_trace);
-    auto* const* const it_stack_trace_end =
+    auto const it_stack_trace_begin = std::begin(stack_trace);
+    auto const it_stack_trace_end =
         std::find(it_stack_trace_begin, std::end(stack_trace), nullptr);
     auto const it_reference_stack_trace_end = std::end(reference_stack_trace);
 
-    auto* const* it_stack_trace = std::find_first_of(
+    auto const it_stack_trace = std::find_first_of(
         it_stack_trace_begin, it_stack_trace_end,
         std::begin(reference_stack_trace), it_reference_stack_trace_end);