libm/test: Add a couple of hypot test cases

These check some corner cases in the computation demonstrating that
our hypot can generate up to 1ulp of error.

Signed-off-by: Keith Packard <[email protected]>

Author: keith-packard

newlib/libm/test/hypotf_vec.c

@@ -16,6 +16,8 @@
  */
 #include "test.h"
  one_line_type hypotf_vec[] = {
+{64, 0,123,__LINE__, 0x3eb6a50c, 0xf4058710, 0x3eb00322, 0x40000000, 0x3eb00322, 0x40000000},   /* 0x1.6a50cf405871p-20=f(0x1.003224p-20,0x1.003224p-20)*/
+{64, 0,123,__LINE__, 0x3eb00322, 0x2fffffff, 0xbeb00322, 0x20000000, 0xbdf6a2d5, 0x80000000},   /* 0x1.003222p-20=f(-0x1.003222p-20, -0x1.6a2d58p-32) */
 {36, 0,123,__LINE__, 0x40085ed7, 0x60000000, 0xbff33333, 0x33333333, 0x40066666, 0x66666666},	/* 3.04631=f(-1.2, 2.8)*/
 {35, 0,123,__LINE__, 0x400869a7, 0xe0000000, 0xbff30a3d, 0x70a3d70a, 0x40067ae1, 0x47ae147b},	/* 3.05159=f(-1.19, 2.81)*/
 {35, 0,123,__LINE__, 0x40087495, 0xe0000000, 0xbff2e147, 0xae147ae1, 0x40068f5c, 0x28f5c290},	/* 3.05693=f(-1.18, 2.82)*/