Bug 1965844 - Part 4: Correctly update search index for resized typed array in lastIndexOf. r=jandem

Test case in <tc39/test262#4477>.

Differential Revision: https://phabricator.services.mozilla.com/D248929

UltraBlame original commit: a7c3286c781fa3d67f2b75540b9be2c476e523a0

Author: marco-c

js/src/vm/TypedArrayObject.cpp

@@ -16113,6 +16113,91 @@ false
 }
 /
 /
+Steps
+6
+-
+8
+.
+if
+(
+fromIndex
+>
+=
+0
+)
+{
+k
+=
+size_t
+(
+std
+:
+:
+min
+(
+fromIndex
+double
+(
+len
+-
+1
+)
+)
+)
+;
+}
+else
+{
+double
+d
+=
+double
+(
+len
+)
++
+fromIndex
+;
+if
+(
+d
+<
+0
+)
+{
+args
+.
+rval
+(
+)
+.
+setInt32
+(
+-
+1
+)
+;
+return
+true
+;
+}
+k
+=
+size_t
+(
+d
+)
+;
+}
+MOZ_ASSERT
+(
+k
+<
+len
+)
+;
+/
+/
 Reacquire
 the
 length
@@ -16131,14 +16216,9 @@ the
 array
 buffer
 .
-len
+size_t
+currentLength
 =
-std
-:
-:
-min
-(
-len
 tarray
 -
 >
@@ -16150,10 +16230,31 @@ valueOr
 (
 0
 )
-)
 ;
 /
 /
+Restrict
+the
+search
+index
+and
+length
+if
+the
+new
+length
+is
+smaller
+.
+if
+(
+currentLength
+<
+len
+)
+{
+/
+/
 Return
 early
 if
@@ -16165,7 +16266,7 @@ zero
 .
 if
 (
-len
+currentLength
 =
 =
 0
@@ -16189,80 +16290,37 @@ true
 }
 /
 /
-Steps
-6
--
-8
+Otherwise
+just
+restrict
+|
+k
+|
+and
+|
+len
+|
+to
+the
+current
+length
 .
-if
-(
-fromIndex
->
-=
-0
-)
-{
 k
 =
-size_t
-(
 std
 :
 :
 min
 (
-fromIndex
-double
-(
-len
+k
+currentLength
 -
 1
 )
-)
-)
 ;
-}
-else
-{
-double
-d
-=
-double
-(
 len
-)
-+
-fromIndex
-;
-if
-(
-d
-<
-0
-)
-{
-args
-.
-rval
-(
-)
-.
-setInt32
-(
--
-1
-)
-;
-return
-true
-;
-}
-k
 =
-size_t
-(
-d
-)
+currentLength
 ;
 }
 }